Rename large file and fix reference

Renaming the large image and changed the index test references to display these images

docs/index-test.md

@@ -120,12 +120,13 @@ end
 
 ### Small image
 
-![](https://assets-cdn.github.com/images/icons/emoji/octocat.png)
+![](assets/images/just-the-docs.png)
 
 ### Large image
 
-![](https://guides.github.com/activities/hello-world/branching.png)
+![](assets/images/large-image.jpg)
 
+"[Wroclaw University Library digitizing rare archival texts](https://www.flickr.com/photos/97810305@N08/9401451269)" by [j_cadmus](https://www.flickr.com/photos/97810305@N08) is marked with [CC BY 2.0](https://creativecommons.org/licenses/by/2.0/?ref=openverse).
 
 ### Definition lists can be used with HTML syntax.
 
@@ -168,7 +169,7 @@ Term2
 
 : Second description of Term1 and Term2,
   possibly more than one line
-  
+
 ### More code
 
 ```